bug#65810: 30.0.50; C-M-f and related functions error out in c++-ts-mode

[João Távora]

Hi maintainers,

This is simple to reproduce, I think:

  > ~/Source/Emacs/emacs/src/emacs --version
  GNU Emacs 30.0.50
  Development version 59c35bf16fbe on master branch; build date 2023-09-04.

  > ~/Source/Emacs/emacs/src/emacs -nw -Q ~/tmp/simple.cpp -f c++-ts-mode

Now just type C-M-f or any C-M-something command.

  Debugger entered--Lisp error: (treesit-invalid-predicate nil)
    treesit-node-match-p(#<treesit-node "{" in 1-2> sexp t)
    #f(compiled-function (node) #<bytecode 0x1a160a6a590699e2>)(#<treesit-node 
"{" in 1-2>)
    treesit-node-match-p(#<treesit-node "{" in 1-2> #f(compiled-function (node) 
#<bytecode 0x1a160a6a590699e2>) t)
    treesit-node-top-level(#<treesit-node "{" in 1-2> #f(compiled-function 
(node) #<bytecode 0x1a160a6a590699e2>) t)
    treesit--things-around(5 sexp)
    treesit--navigate-thing(5 -1 beg sexp restricted)
    treesit-beginning-of-thing(sexp 1 restricted)
    treesit-forward-sexp(-1)
    forward-sexp(-1 nil)
    forward-sexp(-1 5)
    backward-sexp(1 5)
    funcall-interactively(backward-sexp 1 5)
    call-interactively(backward-sexp nil nil)
    command-execute(backward-sexp)

simple.cpp can be any C++ file, from a simple

   int main() {return 0;}

to a completely empty file.

When debug-on-error is nil, there is an further error message in
*Messages*, but I don't know what it means:

   Invalid predicate, see `treesit-thing-settings' for valid forms for a 
predicate: nil [4 times]

I installed my C++ grammar with M-x treesit-install-language-grammar,
entered 'cpp' (treesit's nickname for C++) and everything else default.

The grammar and treesitter seems to be working, I get indentation and
font-locking, for example.

Furthermore I can confirm this same behavior with a version of the
grammar installed today and installed some months ago.

Thanks,
João


In GNU Emacs 30.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version
 3.24.36, cairo version 1.17.8) of 2023-09-04 built on krug
Repository revision: 40514ebf7de644bad984acaeb3ea72b973dae18f
Repository branch: master
System Description: Arch Linux

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: C
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: C++//

Minor modes in effect:
  whitespace-mode: t
  server-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  savehist-mode: t
  windmove-mode: t
  winner-mode: t
  fido-vertical-mode: t
  icomplete-vertical-mode: t
  icomplete-mode: t
  fido-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  global-company-mode: t
  company-mode: t
  xclip-mode: t
  xterm-mouse-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  window-divider-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  hs-minor-mode: t

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threads dbusbind inotify lcms2 dynamic-setting system-font-setting
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make-network-process emacs)

Memory information:
((conses 16 1068497 236334) (symbols 48 55213 15)
 (strings 32 280969 46949) (string-bytes 1 7753809)
 (vectors 16 147167) (vector-slots 8 2762875 94473)
 (floats 8 1059 16219) (intervals 56 23001 4930) (buffers 992 102))